diff --git a/src/util.js.h b/src/util.js.h
index 2d965f443..8a7541b47 100644
--- a/src/util.js.h
+++ b/src/util.js.h
@@ -10,6 +10,7 @@
 
 #include <stdbool.h>
 
+/** An event loop. */
 typedef struct uv_loop_s uv_loop_t;
 
 /**